Thread: how to send out multiple commands using channel(exec)

Hi Folks,

I am trying to send out multiple commands using the same channel and grab the out output stating whether the execution was succssful or not?
But when I am trying to send out 2 commands in row, its not working.

PLease find code below:

package eclipsepackage;
 
import java.io.IOException;
import java.io.InputStream;
 
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSchException;
 
//import IOExceptions;
 
public class GetLastCommandStatus extends VerifyHostReachable
{
	 public int rVal = 0;
	 public String cmd = "ls";
	 public String cmd1 = "echo $?";
 
 
 
	 public void cHKval() throws JSchException, IOException
	 {
	   ChannelExec channel3 = (ChannelExec) session.openChannel("exec");	
       channel3.setCommand(cmd ; cmd1); //cmd1 will only be run if the first command is successful
       channel3.setInputStream(null);
	   InputStream in = channel3.getInputStream();
	   channel3.connect();
       gLastCmdStatus(in,channel3); 
       channel3.disconnect();
       //channel3.setInputStream();
 
     }
 
 
	private void gLastCmdStatus(InputStream in, ChannelExec channel3) throws IOException 
	{
		//byte[] b = new byte[10];
		while (true)
	    {
	        while (in.available() > 0) 
	        {
	            System.out.println("Execution of last command was not successful;\n");
	            byte[] tmp = new byte[1024];
	            int i = in.read(tmp, 0, 1024);
	            /*
	              Number of bytes actually read is returned as an integer.
 
	             */
	            if (i < 0) 
	            {
	                break;
	            }
	            String line = new String(tmp, 0, i);
	            System.out.println(line); 
 
	        }
	        if (channel3.isClosed())
	        {
	            break;
	        }
	        try 
	        {
	            Thread.sleep(1000);
	        } 
	        catch (Exception ee)
	        {
	            //ignore
	        }
 
 
	    }
    }
}

Its giving error when I am passing 2 commands in row...
cmd1 will let me know the result of first cmd executed.

Please let me know. Thanks in advance !!!



Thanks,
Asif Masood

Hi Folks,

I am trying to send out multiple commands using the same channel and grab the out output stating whether the execution was succssful or not?
But when I am trying to send out 2 commands in row, its not working.

PLease find code below:

package eclipsepackage;
 
import java.io.IOException;
import java.io.InputStream;
 
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSchException;
 
//import IOExceptions;
 
public class GetLastCommandStatus extends VerifyHostReachable
{
	 public int rVal = 0;
	 public String cmd = "ls";
	 public String cmd1 = "echo $?";
 
 
 
	 public void cHKval() throws JSchException, IOException
	 {
	   ChannelExec channel3 = (ChannelExec) session.openChannel("exec");	
       channel3.setCommand(cmd ; cmd1); //cmd1 will only be run if the first command is successful
       channel3.setInputStream(null);
	   InputStream in = channel3.getInputStream();
	   channel3.connect();
       gLastCmdStatus(in,channel3); 
       channel3.disconnect();
       //channel3.setInputStream();
 
     }
 
 
	private void gLastCmdStatus(InputStream in, ChannelExec channel3) throws IOException 
	{
		//byte[] b = new byte[10];
		while (true)
	    {
	        while (in.available() > 0) 
	        {
	            System.out.println("Execution of last command was not successful;\n");
	            byte[] tmp = new byte[1024];
	            int i = in.read(tmp, 0, 1024);
	            /*
	              Number of bytes actually read is returned as an integer.
 
	             */
	            if (i < 0) 
	            {
	                break;
	            }
	            String line = new String(tmp, 0, i);
	            System.out.println(line); 
 
	        }
	        if (channel3.isClosed())
	        {
	            break;
	        }
	        try 
	        {
	            Thread.sleep(1000);
	        } 
	        catch (Exception ee)
	        {
	            //ignore
	        }
 
 
	    }
    }
}

Its giving error when I am passing 2 commands in row...
cmd1 will let me know the result of first cmd executed.

Please let me know. Thanks in advance !!!



Thanks,
Asif Masood

hello Norm,

I didn't have any clue/idea under whose section I should put this thread, hence i put this in two different sections which I thought is nearer to thread.
I don't have API doc for the class. How to find out what you are mentioning about !!


Thanks in advance !!!

Thanks,
Asif